Everyday Ten Ask CCIE R&S Written

1. Question: How to turn off the authenticity detection information of the optical module?

Answer: It is not the original log prompt message to close the optical module: fiber antifake Ill

2. Question: The intranet server is mapped to the public network address. The intranet can access the server and the external network can also access the server through the mapped address and port but the public network address and port mapped inside and outside cannot be accessed;

Answer: User made policy routing caused by policy routing. Allowing the intranet to access the intranet server can be solved.

3. Question: How does DHCP be delegated to a specific IP address of a specific terminal?

Answer: You cannot create the same address pool as the dynamic address pool. You must create a new address pool.

4. Question: All the lights on the switch are not lit, only the power supply comes with. The fan will turn a little bit

Answer: The engine's power connector is faulty and the engine's connector on the backplane is faulty.

5. Question: What is the difference between the drain and the return?

Answer: The port of N18K to the firewall is the drain port and the port coming out of the firewall is the return port.

6. Question: If you forgot the ONC password , can you retrieve it through the underlying password?

Answer: It is currently impossible to achieve

7. Question: Customer feedback switch crashes restart

Answer: You can use the following command to confirm whether there is a real crash:

      Debug su

      Show exception

      If the stack information and system HALT are output again, there is a crash condition.

8. Question: How do I view a MAC address attack?

Answer: Use the show command to check the number of address tables, or view the number of arp tables. Show more times to see if there is a sudden increase or decrease.

9. Question: How many camera algorithms can the switch support?

Answer: take the bandwidth of the interface connected to the upper port bandwidth/switch and the hard disk recorder;

      Interface bandwidth *80% divided by the megabyte of code stream

      For example, the interface bandwidth is 1000, and the code stream is megabytes 4M. 1000*80% divided by 4 equals 200

10. Question: Show arp if the arp table is incomplete?

Answer: 1. If it is a transparent link, confirm whether the ARP-CHECK check is enabled.  Or whether there is related ACL matching filtering or physical link problem.

      2. AEP learning is incomplete on the direct link. You can learn the ARP entry on the switch port and quickly locate the fault.

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